package com.webserver.core;

import com.webserver.http.HttpServletRequest;

import java.io.*;
import java.net.Socket;
import java.util.HashMap;
import java.util.Map;

/**
 * 线程任务
 * 负责与特定的客户端进行HTTP交互.
 */
public class ClientHandler implements Runnable{
    private Socket socket;

    public ClientHandler(Socket socket){
        this.socket = socket;
    }

    @Override
    public void run() {
        try {
            //http://localhost:8088/myweb/index.html
            //http://localhost:8088/myweb/classTable.html
            //http://localhost:8088/
            //1解析请求
            HttpServletRequest request = new HttpServletRequest(socket);

            //2处理请求
            String path = request.getUri();

            //3发送响应
            //将./webapps/myweb/index.html响应给浏览器
            File file = new File("./webapps"+path);

            //状态行相关信息
            int statusCode;
            String statusReason;

            if(file.isFile()){//如果定位是文件
                statusCode = 200;
                statusReason = "OK";
            }else{//不是文件(要么不存在,要么是目录,404情况)
                statusCode = 404;
                statusReason = "NotFound";
                file = new File("./webapps/root/404.html");
            }
            /*
                HTTP/1.1 200 OK(CRLF)
                Content-Type: text/html(CRLF)
                Content-Length: 2546(CRLF)(CRLF)
                1011101010101010101......
             */
            OutputStream out = socket.getOutputStream();
            //3.1发送状态行
            String line = "HTTP/1.1"+" "+statusCode+" "+statusReason;
            byte[] data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//发送一个回车符
            out.write(10);//发送一个换行符

            //3.2发送响应头
            line = "Content-Type: text/html";
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//发送一个回车符
            out.write(10);//发送一个换行符

            line = "Content-Length: " + file.length();
            data = line.getBytes("ISO8859-1");
            out.write(data);
            out.write(13);//发送一个回车符
            out.write(10);//发送一个换行符

            //单独发送CRLF表示响应头部分发送完毕
            out.write(13);//发送一个回车符
            out.write(10);//发送一个换行符

            //3.3发送响应正文
            FileInputStream fis = new FileInputStream(file);
            int len;
            byte[] buf = new byte[1024*10];
            while((len = fis.read(buf))!=-1){
                out.write(buf,0,len);
            }
            System.out.println("响应发送完毕");

        } catch (IOException e) {
            e.printStackTrace();
        } finally {
            try {
                //响应后断开连接
                socket.close();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }


}
